A lot of good reading info..............I have used conventional oils all my life and have very good luck with them,last company car had 250,000 miles,present company car has 285,000 miles, neither engine has had more than regular (4000 miles)
oil changes and tuneups............
Talked to a Shell Engineer about some of the same stuff here, he also recommends conventional
oil based soley of price, he also states
synthetic and conventional oils should be changed at the same interval and most autos can go 15,000 miles between
oil changes...............He showed me a study Shell did a few years ago with their diesel oil Rotella T.......they took a brand new 18 wheeler with a Cat engine for a cross-country trucking firm and filled it with Rottela T and sent him on his way, all they did was change the oil filter at the manufacvters recomendations and add the needed amount of oil lost with the filter change, they wanted to see how long the engine would last under these conditions, THEY QUIT/GAVE UP THE TEST AT 1,000,000, THAT'S ONE MILLION MILES, the darn thing was still going strong.....................go figure...........I know diesels are different from gas enignes, but sometimes these things make you wonder...........
Well, I'll keep my oil changes to 4,000 miles on my personal cars and every other race on the race car..........cheap insurance to me...............
David